55720016 has 60 divisors (see below), whose sum is σ = 125718516. Its totient is φ = 23823360.

The previous prime is 55720003. The next prime is 55720061. The reversal of 55720016 is 61002755.

It can be written as a sum of positive squares in 2 ways, for example, as 32718400 + 23001616 = 5720^2 + 4796^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32066 + ... + 33758.

Almost surely, 2^55720016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55720016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62859258).

55720016 is an abundant number, since it is smaller than the sum of its proper divisors (69998500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55720016 is a wasteful number, since it uses less digits than its factorization.

55720016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740 (or 1723 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 55720016 is about 7464.5841143362. The cubic root of 55720016 is about 381.9475636842.

The spelling of 55720016 in words is "fifty-five million, seven hundred twenty thousand, sixteen".